In recent years mobile computing has experienced an explosive growth, mainly due to the integration of wireless networks with the wired Internet. To deploy bandwidth-greedy multimedia applications on such heterogeneous environments, efficient congestion control algorithms are required. In such environments, a packet can cross one or more wireless links before eventually reaching its destination...

A numbers of important developments have led to an increasing attractiveness for very high speed electrical machines (either motor or generator). Specifically the increasing switching speed of power electronics, high energy magnets, high strength retaining materials, better high speed bearings and improvements in design analysis are the primary drivers in a move to higher speed. The design chal...

Heat losses from a trough cavity receiver were investigated in order to eventually optimise the reactor geometry for ammonia-based solar energy storage with troughs, which are prominent in the SEGs plants of California. To this end, experiments were performed with a small-scale receiver containing heating elements. This gave free convection loss coefficient values from 0.3 to 11.8 W/(m.C) from ...

Optimal reconfiguration and capacitor placement are used to reduce power losses and keep the voltage within its allowable interval in power distribution systems considering voltage, current, and radial condition constraints. It is needed to solve two nonlinear discrete optimization problems simultaneously, so an intelligent algorithm is used to reach an optimum solution for network power losses...

A small pancake coil was wound using 1.2m long, 10 mm wide YBCO coated superconductor tape with impregnation by epoxy resin. The coil was immersed in liquid nitrogen and tested in several regimes. In the DC regime, we measured the I-V curve, the hysteresis of the magnetic field-current curve at liquid nitrogen temperature and the radial component of the coil field at the coil edges. The critica...

This thesis presents High frequency Soft Switching DC-DC boost Converter. The circuit consists of a general Boost Converter with an additional resonant circuit which has a switch, inductor, capacitor and a diode.In general Boost Converter circuits have snubber circuits where switching losses are dissipated in external passive resistors; which is known as hard switching. As the switching frequen...